Multiple electrode vectors for implantable cardiac treatment devices
First Claim
1. An implantable electrical cardiac treatment device comprising:
- first, second, and third electrodes, the second electrode provided at a first distance from the first electrode along a lead assembly, the third electrode provided at a second distance from the first electrode along a lead assembly; and
operational circuitry electrically coupled to the first, second and third electrodes such that sensing can be performed using any pair chosen therefrom;
wherein the operational circuitry is adapted to perform the following steps;
observe a signal metric between at least two of the following sensor pairs;
first-second, first-third, and second-third;
select a default sensor pair for use in cardiac signal analysis by determining which pair performs the best as measured by the signal metric.
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Abstract
The implantable cardiac treatment system of the present invention is capable of choosing the most appropriate electrode vector to sense within a particular patient. In certain embodiments, the implantable cardiac treatment system determines the most appropriate electrode vector for continuous sensing based on which electrode vector results in the greatest signal amplitude, or some other useful metric such as signal-to-noise ratio (SNR). The electrode vector possessing the highest quality as measured using the metric is then set as the default electrode vector for sensing. Additionally, in certain embodiments of the present invention, a next alternative electrode vector is selected based on being generally orthogonal to the default electrode vector. In yet other embodiments of the present invention, the next alternative electrode vector is selected based on possessing the next highest quality metric after the default electrode vector. In some embodiments, if analysis of the default vector is ambiguous, the next alternative electrode vector is analyzed to reduce ambiguity.
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Citations
25 Claims
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1. An implantable electrical cardiac treatment device comprising:
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first, second, and third electrodes, the second electrode provided at a first distance from the first electrode along a lead assembly, the third electrode provided at a second distance from the first electrode along a lead assembly; and
operational circuitry electrically coupled to the first, second and third electrodes such that sensing can be performed using any pair chosen therefrom;
wherein the operational circuitry is adapted to perform the following steps;
observe a signal metric between at least two of the following sensor pairs;
first-second, first-third, and second-third;
select a default sensor pair for use in cardiac signal analysis by determining which pair performs the best as measured by the signal metric. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16, 17, 18, 19)
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9. A method of cardiac signal analysis comprising:
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implanting an implantable electrical cardiac treatment device and associated lead assembly into a patient such that operational circuitry housed in the device is coupled to first, second, and third electrodes;
observing a signal metric between two pairs of electrodes chosen from the first, second and third electrodes;
identifying a default electrode pair based upon observation of the signal metric; and
using the default electrode pair for sensing of cardiac signals. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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20. A method of operating an implantable electrical cardiac treatment device having operational circuitry for performing cardiac performance evaluation and treatment, the method comprising:
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coupling first, second, and third implanted electrodes to the operational circuitry;
observing a sensing metric for selected pairs of the implanted electrodes; and
identifying a default electrode pair for use in evaluation of cardiac signals. - View Dependent Claims (21, 22)
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23. A method of cardiac signal analysis comprising:
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capturing a first signal from a first implanted electrode pair;
constructing a first template using the first signal;
capturing a second signal from a second implanted electrode pair;
constructing a second template using the second signal; and
capturing a signal using the first and second electrode pairs and using the first and second templates to determine whether a treatable cardiac condition exists. - View Dependent Claims (24)
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25. An implantable cardiac treatment system comprising an implantable canister housing operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry wherein the operational circuitry is configured and coupled to the electrodes to define at least a first implanted electrode pair and a second implanted electrode pair, the operational circuitry being configured to perform the steps of:
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capturing a first signal from the first implanted electrode pair;
constructing a first template using the first signal;
capturing a second signal from the second implanted electrode pair;
constructing a second template using the second signal; and
capturing a signal using the first and second electrode pairs and using the first and second templates to determine whether a treatable cardiac condition exists.
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Specification